Freelance Data Engineer · Germany

Turning raw data into
decisions.

From source to dashboard: data models, ETL/ELT pipelines and analytics, end to end. Solutions architect and developer for business intelligence, 20+ years in IT.

Business Intelligence Query Solutions

BIQS stands for exactly that: targeted queries that turn business data into a solid basis for decisions.

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Available from early 2027Freelance since 2015Based in Troisdorf, DESQL · Python · Power BI · Azure Fabric

Services

The full BI spectrum — end to end, from a single partner

From requirements analysis through data model and data pipelines to reports and dashboards.

Data models & architecture

Dimensional models and data warehouse design that make analytics reliable.

Requirements & data analysis
Star schema, facts & dimensions
Entity models & harmonization

ETL / ELT & data pipelines

Integration and preparation from many source systems — documented and reusable.

Fabric, stored procedures, Dagster
Medallion architecture (bronze/silver/gold)
Data migration into new applications

Analysis, reporting & OLAP

OLAP cubes, metrics and dashboards — up to customer insights and customer value.

SSAS (tabular/multidim.), Power BI
DAX / MDX, self-service BI
Data mining & predictive models

Projects

Selected reference projects

Every project follows one schema: Context, Task, Result — plus the stack used.

2025 — today

Agriculture & market data

Data Fabric Portal

ContextNew Azure Fabric warehouse, legacy data migration.

TaskDWH sub-project lead & developer: ELT processes and harmonization.

ResultCustomers analyze market data right in the web portal — Power BI Embedded on a Fabric warehouse (medallion architecture).

Azure FabricSQL ServerAzure DevOpsPower BI

2023 — 2025

Trade fairs & events

New data warehouse

ContextData from CRM, ticketing, billing, webshop, tracking and more.

TaskDeveloper & business analyst: integration, entity model, star schema.

ResultOne central DWH instead of scattered silos: consistent metrics, dashboards and ad-hoc analyses in Power BI.

datasqillSQL Server 2019Power BIBitbucket

2020 — today

Professional information & software

Master Data Management

ContextMDM for customer and contact data.

TaskArchitect & developer: loading, business rules, standardization.

ResultUnified, rule-checked customer and contact data; business users validate master data themselves via a dedicated UI.

SQL Server 2019DagsterGit · Bitbucket

2018 — today

Press distribution · association

DWH operations & Power BI

ContextExtend and modernize the DWH.

TaskDeveloper & administrator: ETL/OLAP, MDX→DAX, gateway & SSO.

ResultReporting modernized from MDX to tabular models and Power BI during live operations — running reliably since 2018.

SSIS · SSASXLCubedPower BITabular Editor

2022 — 2023

Education & publishing

Product Analytics

ContextMake UX impact of digital products measurable.

TaskPower BI developer & business analyst: UX metrics, DAX, tracking events.

ResultProduct teams make UX decisions based on data — and run their own analyses after self-service coaching.

Power BI ProDAXProduct Analytics

2017 — 2020

Financial services · leasing

International data migration

ContextMigration of decentralized leasing applications from several country units.

TaskDeveloper: source analysis, mapping, transformation & exclusion logic.

ResultSeveral country units successfully migrated to the central target application — incl. testing and go-live support.

Clover ETLSQL Server 2012

Tech stack

Tools & technologies

Specialized in the Microsoft BI platform, complemented by proven ETL and OLAP tools — plus AI-assisted development.

Languages

T-SQL

Transact-SQL — Microsoft SQL Server's SQL dialect for querying and programming.

PL/SQL

Procedural Language/SQL — Oracle's procedural SQL extension.

DAX

Data Analysis Expressions — formula language for Power BI, Power Pivot and SSAS Tabular.

MDX

Multidimensional Expressions — query language for multidimensional OLAP cubes.

Python

Versatile programming language for data preparation, automation and analytics.

ETL / ELT

Fabric Pipelines

Automated, visual workflows that orchestrate data engineering tasks.

Fabric Notebooks

Web-based, interactive development environments for processing and analyzing large datasets.

Dagster

Modern orchestrator for data pipelines (Python).

Clover ETL

ETL tool (CloverDX) for data integration and transformation.

KNIME

Visual platform for data analytics, ETL and data science.

Power Query

M-based ETL tool in Excel and Power BI for loading and transforming data.

datasqill

Lean transformation and data engineering solution for data integration.

SSIS

SQL Server Integration Services — Microsoft's ETL platform.

Warehouse / DB

SQL Server '08–'22

Microsoft SQL Server (versions 2008 to 2022) — relational database management system.

Azure SQL

Managed SQL Server database service on Microsoft Azure (PaaS).

MS Fabric

Microsoft Fabric — integrated SaaS analytics platform (warehouse, lakehouse, Power BI).

Oracle

Oracle Database — relational database management system.

OLAP / BI

SSAS tab./multidim.

SQL Server Analysis Services — OLAP / tabular models for analytics.

Power BI

Microsoft's platform for interactive reports and dashboards.

SSRS

SQL Server Reporting Services — pixel-perfect, paginated reporting.

XLCubed

Excel-based analysis and reporting tool for OLAP cubes (now FluenceXL).

Power Pivot

In-memory data modeling with DAX in Excel.

Cloud / DevOps

Microsoft Azure

Microsoft's cloud platform for compute, databases and analytics.

Azure DevOps

Platform for version control, CI/CD and project boards.

Git · Bitbucket

Version control with Git; Bitbucket for repository hosting.

JIRA · Confluence

Atlassian tools for task/project management (JIRA) and documentation (Confluence).

AI

Claude Opus

Anthropic's AI language model for complex reasoning and coding.

Claude Code

Anthropic's agentic AI coding tool for terminal and IDE.

Google Gemini

Multimodal AI model family by Google DeepMind.

Google Antigravity

Agentic development platform (AI IDE) by Google, built on Gemini.

About

Tobias Kraschewski

As a freelance data engineer and BI developer I build business intelligence applications across the full BI spectrum — from data pipelines to reports and dashboards.

For over 20 years I have implemented and maintained IT systems as a developer, business analyst and project lead. My focus is using IT to support the business — especially where data turns into insight for steering and optimization.

Customer InsightsCustomer Lifetime ValueCampaign managementData WarehouseData migrationMaster Data Management

2015 — today